Manually Revert "[DOM XSLT] Use a request to stop transforming."RC_20220219

Causes a hang on Windows and simply a blank page on unix when viewing XML

4 files changed, 15 insertions, 114 deletions

diff --git a/dom/xslt/xslt/txExecutionState.cpp b/dom/xslt/xslt/txExecutionState.cpp
index 0ca6143a95..5caaf77f0c 100644
--- a/dom/xslt/xslt/txExecutionState.cpp
+++ b/dom/xslt/xslt/txExecutionState.cpp
@@ -480,18 +480,15 @@ txExecutionState::getCurrentTemplateRule()
     return &mTemplateRules[mTemplateRules.Length() - 1];
 }
 
-nsresult
-txExecutionState::getNextInstruction(txInstruction* aInstruction) {
-  if (mStopProcessing) {
-    return NS_ERROR_FAILURE;
-  }
-
-  aInstruction = mNextInstruction;
-  if (aInstruction) {
-    mNextInstruction = aInstruction->mNext;
-  }
-
-  return NS_OK;
+txInstruction*
+txExecutionState::getNextInstruction()
+{
+    txInstruction* instr = mNextInstruction;
+    if (instr) {
+        mNextInstruction = instr->mNext;
+    }
+    
+    return instr;
 }
 
 nsresult
diff --git a/dom/xslt/xslt/txExecutionState.h b/dom/xslt/xslt/txExecutionState.h
index 68436424f2..cd54671791 100644
--- a/dom/xslt/xslt/txExecutionState.h
+++ b/dom/xslt/xslt/txExecutionState.h
@@ -131,7 +131,7 @@ public:
     }
 
     // state-modification functions
-    nsresult getNextInstruction(txInstruction* aInstruction);
+    txInstruction* getNextInstruction();
     nsresult runTemplate(txInstruction* aInstruction);
     nsresult runTemplate(txInstruction* aInstruction,
                          txInstruction* aReturnTo);
@@ -140,7 +140,6 @@ public:
     nsresult bindVariable(const txExpandedName& aName,
                           txAExprResult* aValue);
     void removeVariable(const txExpandedName& aName);
-    void stopProcessing() { mStopProcessing = true; }
 
     txAXMLEventHandler* mOutputHandler;
     txAXMLEventHandler* mResultHandler;
@@ -175,7 +174,6 @@ private:
     txKeyHash mKeyHash;
     RefPtr<txResultRecycler> mRecycler;
     bool mDisableLoads;
-    bool mStopProcessing = false;
 
     static const int32_t kMaxRecursionDepth;
 };
diff --git a/dom/xslt/xslt/txMozillaXSLTProcessor.cpp b/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
index 18e86f45ae..6aec6052f4 100644
--- a/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
+++ b/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
@@ -653,69 +653,6 @@ txMozillaXSLTProcessor::TransformToDocument(nsIDOMNode *aSource,
     return TransformToDoc(aResult, true);
 }
 
-class XSLTProcessRequest final : public nsIRequest {
- public:
-  explicit XSLTProcessRequest(txExecutionState* aState) : mState(aState) {}
-
-  NS_DECL_ISUPPORTS
-  NS_DECL_NSIREQUEST
-
-  void Done() { mState = nullptr; }
-
- private:
-  ~XSLTProcessRequest() {}
-  txExecutionState* mState;
-};
-NS_IMPL_ISUPPORTS(XSLTProcessRequest, nsIRequest)
-
-NS_IMETHODIMP
-XSLTProcessRequest::GetName(nsACString& aResult) {
-  aResult.AssignLiteral("about:xslt-load-blocker");
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-XSLTProcessRequest::IsPending(bool* _retval) {
-  *_retval = true;
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-XSLTProcessRequest::GetStatus(nsresult* status) {
-  *status = NS_OK;
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-XSLTProcessRequest::Cancel(nsresult status) {
-  mState->stopProcessing();
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-XSLTProcessRequest::Suspend(void) { return NS_OK; }
-
-NS_IMETHODIMP
-XSLTProcessRequest::Resume(void) { return NS_OK; }
-
-NS_IMETHODIMP
-XSLTProcessRequest::GetLoadGroup(nsILoadGroup** aLoadGroup) {
-  *aLoadGroup = nullptr;
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-XSLTProcessRequest::SetLoadGroup(nsILoadGroup* aLoadGroup) { return NS_OK; }
-
-NS_IMETHODIMP
-XSLTProcessRequest::GetLoadFlags(nsLoadFlags* aLoadFlags) {
-  *aLoadFlags = nsIRequest::LOAD_NORMAL;
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-XSLTProcessRequest::SetLoadFlags(nsLoadFlags aLoadFlags) { return NS_OK; }
-
 nsresult
 txMozillaXSLTProcessor::TransformToDoc(nsIDOMDocument **aResult,
                                        bool aCreateDataDocument)
@@ -729,25 +666,6 @@ txMozillaXSLTProcessor::TransformToDoc(nsIDOMDocument **aResult,
 
     txExecutionState es(mStylesheet, IsLoadDisabled());
 
-    nsIDocument* sourceDoc = mSource->OwnerDoc();
-    nsCOMPtr<nsILoadGroup> loadGroup = sourceDoc->GetDocumentLoadGroup();
-    if (!loadGroup) {
-      nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(mOwner);
-      if (win && win->IsCurrentInnerWindow()) {
-        nsIDocument* doc = win->GetDoc();
-        if (doc) {
-          loadGroup = doc->GetDocumentLoadGroup();
-        }
-      }
-
-      if (!loadGroup) {
-        return NS_ERROR_FAILURE;
-      }
-    }
-
-    RefPtr<XSLTProcessRequest> xsltProcessRequest = new XSLTProcessRequest(&es);
-    loadGroup->AddRequest(xsltProcessRequest, nullptr);
-
     // XXX Need to add error observers
 
     // If aResult is non-null, we're a data document
@@ -762,9 +680,6 @@ txMozillaXSLTProcessor::TransformToDoc(nsIDOMDocument **aResult,
         rv = txXSLTProcessor::execute(es);
     }
 
-    xsltProcessRequest->Done();
-    loadGroup->RemoveRequest(xsltProcessRequest, nullptr, NS_OK);
-
     nsresult endRv = es.end(rv);
     if (NS_SUCCEEDED(rv)) {
       rv = endRv;
diff --git a/dom/xslt/xslt/txXSLTProcessor.cpp b/dom/xslt/xslt/txXSLTProcessor.cpp
index cd1030de49..7335d7b844 100644
--- a/dom/xslt/xslt/txXSLTProcessor.cpp
+++ b/dom/xslt/xslt/txXSLTProcessor.cpp
@@ -43,21 +43,12 @@ txXSLTProcessor::shutdown()
 nsresult
 txXSLTProcessor::execute(txExecutionState& aEs)
 {
-  nsresult rv;
-  do {
+    nsresult rv = NS_OK;
     txInstruction* instr;
-    nsresult rv = aEs.getNextInstruction(instr);
-    if (NS_FAILED(rv)) {
-      return rv;
+    while ((instr = aEs.getNextInstruction())) {
+        rv = instr->execute(aEs);
+        NS_ENSURE_SUCCESS(rv, rv);
     }
 
-    if (!instr) {
-      // reached null, no more instructions.
-      return NS_OK;
-    }
-
-    rv = instr->execute(aEs);
-  } while (NS_SUCCEEDED(rv));
-
-  return rv;
+    return NS_OK;
 }